On Thu, 4 Jan 2018 09:56:47 -0800 Tim Chen <tim.c.c...@linux.intel.com> wrote:
> There are 2 ways to control IBRS > > 1. At boot time > noibrs kernel boot parameter will disable IBRS usage > > Otherwise if the above parameters are not specified, the system > will enable ibrs and ibpb usage if the cpu supports it. > > 2. At run time > echo 0 > /sys/kernel/debug/ibrs_enabled will turn off IBRS > echo 1 > /sys/kernel/debug/ibrs_enabled will turn on IBRS in kernel > echo 2 > /sys/kernel/debug/ibrs_enabled will turn on IBRS in both > userspace and kernel > > The implementation was updated with input from Andrea Arcangeli. > Why are these under debug ? This isn't a debugging thing. Alan
